If those chat logs are from 2017, here's what happened that day:

https://www.nytimes.com/2017/05/17/us/politics/robert-mueller-special-counsel-russia-investigation.html

Robert S. Mueller III, a former F.B.I. director under Presidents George W. Bush and Barack Obama, was chosen to oversee the inquiry amid escalating pressure.Credit…Christopher Gregory/The New York Times

By Rebecca R. Ruiz and Mark Landler

May 17, 2017

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WASHINGTON — The Justice Department appointed Robert S. Mueller III, a former F.B.I. director, as special counsel on Wednesday to oversee the investigation into ties between President Trump’s campaign and Russian officials, dramatically raising the legal and political stakes in an affair that has threatened to engulf Mr. Trump’s four-month-old presidency.

The decision by the deputy attorney general, Rod J. Rosenstein, came after a cascade of damaging developments for Mr. Trump in recent days, including his abrupt dismissal of the F.B.I. director, James B. Comey, and the subsequent disclosure that Mr. Trump asked Mr. Comey to drop the investigation of his former national security adviser, Michael T. Flynn.